A major security clearance contractor with offices in Grove City is losing massive federal contracts.

A congressional spokeswoman said the federal Office of Personnel Management plans to terminate its massive contracts with USIS, the major security clearance contractor that was targeted last month by a cyber attack. 

The computer network intrusion compromised the personal files of as many as 25,000 government workers. 

USIS handles the security clearances of about 2.5 million government workers.